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Identification of glycoproteins targeted by Trypanosoma cruzi trans-sialidase, a virulence factor that disturbs lymphocyte glycosylation
Instituto de Investigaciones Biotecnológicas, Universidad Nacional de San Martín, B1650WGA San Martín, Argentina.
Department of Chemistry, University of California, CA95616 Davis, USA.
Department of Chemistry, University of California, CA94720 Berkeley, USA.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm , Ludwig Institute for Cancer Research.
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2010 (English)In: Glycobiology, ISSN 0959-6658, E-ISSN 1460-2423, Vol. 20, no 7, 833-842 p.Article in journal (Refereed) Published
Abstract [en]

Trypanosoma cruzi, the agent of the American trypanosomiasis or Chagas disease, bypasses its lack of de novo synthesis of sialic acids by expressing a surface-anchored trans-sialidase. This enzyme transfers sialic acid residues from the host's sialylglycoconjugates to the parasite's galactosylglycoconjugates. In addition to carrying out a pivotal role in parasite persistence/replication within the infected mammal, the trans-sialidase is shed into the bloodstream and induces alterations in the host immune system by modifying the sialylation of the immune cells. A major obstacle to understand these events is the difficulty to identify the transferred sialic acid among all those naturally occurring on the cell surface. Here, we report the use of azido-modified unnatural sialic acid to identify those molecules that act as cell surface acceptors of the sialyl residue in the trans-sialidase-catalyzed reaction, which might then be involved in the immune alterations induced. In living parasites, we readily observed the transfer of azido-sialic acid to surface mucins. When evaluating mouse thymocytes and splenocytes as acceptors of the azido-sugar, a complex pattern of efficiently tagged glycoproteins was revealed. In both leukocyte populations, the main proteins labeled were identified as different CD45 isoforms. Disruption of the cell architecture increased the number and the molecular weight distribution of azido-sialic acid tagged proteins. Nevertheless, CD45 remained to be the main acceptor. Mass spectrometry assays allowed us to identify other acceptors, mainly integrins. The findings reported here provide a molecular basis to understand the abnormalities induced in the immune system by the trans-sialidase during T. cruzi infection.

Place, publisher, year, edition, pages
Oxford University Press , 2010. Vol. 20, no 7, 833-842 p.
Keyword [en]
Azido-sugars, CD45, integrins, parasite–host interactions, sialylation
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-130883DOI: 10.1093/glycob/cwq037ISI: 000278437800004PubMedID: 20354005OAI: oai:DiVA.org:uu-130883DiVA: diva2:351709
Available from: 2010-09-15 Created: 2010-09-15 Last updated: 2011-02-24Bibliographically approved

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